import threading
import time
g_list = list()

def add_list():
    for item in range(5):
        g_list.append(item)
        print(item)
        time.sleep(0.2)
        pass
    pass

def read_list():
    print(g_list)
    pass

if __name__ == '__main__':
    add_thread = threading.Thread(target=add_list)
    add_thread.start()
    # 当前进程等待add_thread进程执行完之后，才能够往下执行
    add_thread.join()
    read_thread = threading.Thread(target=read_list)
    read_thread.start()
